What helped me the most is the public presentation, first it feels like you will die and your body will keep on sweating, your heart will keep on beating before you start and once your start you won't feel your heart again because at that moment, all you're thinking of is the ppl staring at you but as soon you're done and trying having a normal conversation with your buddy, you won't stutter at all for a while!!!!!!. it's scary but it works like magic